Octogen is an open-source code interpreter driven by GPT4 and CodeLlama. It assists developers with real-time syntax checking and suggestions during code writing, supporting multiple programming languages. By combining GPT4's intelligent prediction capabilities and CodeLlama's code parsing technology, Octogen can provide more accurate and efficient code completion, error checking, and syntax correction features. Octogen boasts advantages such as ease of use, open-source nature, and a flexible pricing model.